Search Publications
A GMRT 610 MHz radio survey of the North Ecliptic Pole (NEP, ADF-N) / Euclid Deep Field North
Burgarella, D.; Shimwell, T. W.; Serjeant, S. +17 more
This paper presents a 610 MHz radio survey covering 1.94 deg
Exploring the directly imaged HD 1160 system through spectroscopic characterization and high-cadence variability monitoring
Ertel, Steve; Woodward, Charles E.; Kenworthy, Matthew A. +15 more
The time variability and spectra of directly imaged companions provide insight into their physical properties and atmospheric dynamics. We present follow-up R ~ 40 spectrophotometric monitoring of red companion HD 1160 B at 2.8-4.2 µm using the double-grating 360° vector Apodizing Phase Plate (dgvAPP360) coronagraph and ALES integral field s…
Constraining ion transport in the diamagnetic cavity of comet 67P
Henri, P.; Rubin, M.; Galand, M. +3 more
The European Space Agency Rosetta mission escorted comet 67P for a 2-yr section of its six and a half-year orbit around the Sun. By perihelion in 2015 August, the neutral and plasma data obtained by the spacecraft instruments showed the comet had transitioned to a dynamic object with large-scale plasma structures and a rich ion environment. One su…
Solar differential rotation coefficients fitted from synoptic magnetic maps
Chu, Zhe; Gu, Haihua
Based on the consecutive synoptic magnetic maps, we devise a new method to calculate the solar differential rotation coefficients. This method is very easy to implement and has a high accuracy. Firstly, based on the two-term or three-term differential rotation formula, we simulate a synoptic map CR$_{n}$ evolves one Carrington Rotation (CR) time o…
Low CI/CO abundance ratio revealed by HST UV spectroscopy of CO-rich debris discs
Hughes, A. Meredith; Redfield, Seth; Roberge, Aki +6 more
The origin and evolution of CO gas in debris discs has been debated since its initial detection. The gas could have a primordial origin, as a remnant of the protoplanetary disc or a secondary exocometary origin. This paper investigates the origin of gas in two debris discs, HD110058 and HD131488, using Hubble Space Telescope (HST) observations of …
Using 26 Al to detect ongoing self-enrichment in young massive star clusters
Forbrich, Jan; Yates, Robert M.; Siegert, Thomas +5 more
Self-enrichment is one of the leading explanations for chemical anomalies in globular clusters. In this scenario, various candidate polluter stars have been proposed to eject gas with altered chemical composition during the self-enrichment process. Most of the proposed polluters will also eject radioactive
Chemical abundances of 20 barium stars from the OHP spectra
Shi, Jianrong; Zhao, Gang; Zhao, Jingkun +7 more
Based on the high resolution and high signal-to-noise spectra, we derived the chemical abundances of 20 elements for 20 barium (Ba-) stars. For the first time, the detailed abundances of four sample stars, namely HD 92482, HD 150430, HD 151101, and HD 177304 have been analysed. Additionally, Ba element abundance has been measured using high-resolu…
Low-redshift absorption in the Seyfert galaxy PG1211+143 - a distant inflow maintaining off-plane accretion or the gravitational redshift of matter orbiting the SMBH?
Page, Kim; Pounds, Ken
The detection of a high-velocity (~0.3c) inflow of highly ionized matter during an extended XMM-Newton observation of the luminous Seyfert galaxy PG1211+143 in 2014 provided the first direct evidence of a short-lived accretion event, and an explanation for the powerful winds (UFOs) now recognized as a common property of many luminous Seyfert galax…
TOI-2447 b / NGTS-29 b: a 69-day Saturn around a Solar analogue
Trifonov, Trifon; Henning, Thomas; Ramsay, Gavin +63 more
Discovering transiting exoplanets with relatively long orbital periods (>10 d) is crucial to facilitate the study of cool exoplanet atmospheres (Teq < 700 K) and to understand exoplanet formation and inward migration further out than typical transiting exoplanets. In order to discover these longer period transiting exoplanets, lon…
K2-370 b: a strongly irradiated sub-Neptune transiting a very active solar-type star
Vanderburg, A.; Sozzetti, A.; Wilson, T. G. +24 more
We report on the detailed characterization of K2-370 b, a transiting sub-Neptune on a 2.14-d orbit around the chromospherically active G-type dwarf HD 284521 (